Bugfix unstructured grid search face index

Should return the integer, not array of integer

Author: VeckoTheGecko

parcels/application_kernels/interpolation.py

@@ -32,7 +32,7 @@ def UXPiecewiseConstantFace(
     This interpolation method is appropriate for fields that are
     face registered, such as u,v in FESOM.
     """
-    return field.data.values[ti, position["Z"][0], position["FACE"][0]][0]
+    return field.data.values[ti, position["Z"][0], position["FACE"][0]]
 
 
 def UXPiecewiseLinearNode(

parcels/uxgrid.py

@@ -95,8 +95,7 @@ def try_face(fid):
         fi, bcoords = self.uxgrid.get_spatial_hash().query([[x, y]])
         if fi == -1:
             raise FieldOutOfBoundError(z, y, x)
-
-        return {"Z": (zi, zeta), "FACE": (fi, bcoords[0])}
+        return {"Z": (zi, zeta), "FACE": (fi[0], bcoords[0])}
 
     def _get_barycentric_coordinates(self, y, x, fi):
         """Checks if a point is inside a given face id on a UxGrid."""